摘要
长周期地震动会对自振周期较长的结构造成严重危害,对于AP1000顶部的大型重力排水箱,尤其要考虑在低频范围内的晃动情况。对于这一非线性问题,数值模拟具有一定的局限性和复杂性,因此建立实验模型,通过振动台模拟实验,选取与水晃动频率一致的正弦三波作为激励,测量不同液深时顶盖各位置的冲击力,并通过与陆道纲提出的计算方法对比,进一步证明了该计算方法的可行性和准确性。同时得出,该计算结果在小振幅晃动时相对偏小,在大振幅晃动时相对偏大,具有一定的保守性。
The structure with long natural vibration period, such as the large-scaled gravity drain tank on the top of AP1000 containment, is vulnerable to long period ground motion. Particularly, the sloshing phenomena in a low frequency range are of great concern. For this kind of nonlinear problem, numerical simulations are complex and possess certain limitations, therefore, we established the experimental models to measure the impact force of the top cover in different positions with various fill depths. The experiments were carried out on the shaking table and the three cycle sine which has the same frequency with the sloshing water was selected as the input excitation. In addition, by comparing with the calculation method proposed by Lu Daogang, the feasibility and accuracy of this calculation method was further verified. At the same time, we found that the calculation results of small amplitude sloshing were relatively small and the results of large amplitude sloshing was relatively large. Hence, the calculation method is considered to be certain conservative.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2015年第5期91-95,共5页
Nuclear Power Engineering
关键词
非线性
正弦三波
冲击力
Nonlinear, Three cycle sine, Impact force
